[Boost-users] [vector_property_map] vector size ?

From: Jairo19_at_[hidden]
Date: 2007-11-20 15:24:52

    Hola:

    I'm new to boost (1.33.1 on Fedora 7) and while setting up some
examples I was trying to get the size/length if my instance of
vector_property_map, but there is no size() method. To test and to move
along, I made a copy of vector_property_map.hpp and added:

        typename std::vector<T>::size_type size()
        {
            return store->size();
        }

       I'm new to this, so I may be doing it all wrong.

        Questions: 
  is there any reason why this method was not included in the library ?
(I understand we may have less elements than the actual vector size) ,

  how do I get the vector size and the real size ? (without iterating
?),  while writing this I remember that on vectors I can do: 
m.storage_end() - m.storage_begin()

  how do I get the keys used in the map ?

   Are these thread safe ?

  lastly, this is what I want to do:

     I want to store 8000 rows and about 300 columns of data, row key
is either an int or a string, let's say an int, column key is an int,
in this case months to allow me to use: 200711, 200710, 200709, etc as
columns. I would like to sort the rows based on the values of some of
the columns (let's say I add all columns from 200611 to 200605 for each
row and sort descending. Because rows do not have values for all the
columns, I figured vector_property_map is a good fit to store the
columns and maybe multi_index, multi_array or a simpler property_map
are also good for the rows. Any suggestions ?

      Thanks.